Hello, i'm new to error codes. I think this is related to Biomes! Caverns and Adeptus Mechanicus. It pops right after Caverns initiates. Any help would be great. Thanks!

Could not execute post-long-event action. Exception: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
[Ref B4539641]
at System.ThrowHelper.ThrowArgumentOutOfRangeException (System.ExceptionArgument argument, System.ExceptionResource resource) [0x00029] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.ThrowHelper.ThrowArgumentOutOfRangeException () [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at AdeptusMechanicus.settings.AMSettings.ProcessWeaponTags (System.Collections.Generic.List`1[T] whiteTags, System.Collections.Generic.List`1[T] blackTags) [0x0042a] in <5f950673d797495b9f0fc887115bf0dd>:0
at AdeptusMechanicus.settings.AMSettings.UpdateWeapons_New () [0x002ab] in <5f950673d797495b9f0fc887115bf0dd>:0
at AdeptusMechanicus.settings.AMSettings.ApplySettings () [0x0002a] in <5f950673d797495b9f0fc887115bf0dd>:0
at AdeptusMechanicus.settings.AMSettings.ApplySettingsStartUp () [0x00020] in <5f950673d797495b9f0fc887115bf0dd>:0
at Verse.LongEventHandler.ExecuteToExecuteWhenFinished () [0x0007c] in <f0ac5eb9b52e4cc396c70fc9a4ee15e5>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root.Update_Patch1 (Verse.Root)
Verse.Root_Entry:Update ()